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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96eac7659281d03b431d8effb358c9119e33dac63b59e3dde5a33afd5ca7d022' 
  AND token = '7qO5zF7j9vgNF4l3+k5A79mUGrZ3EjFy8cvlVXxokXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}